Hip Arthroplasty Using Collarless Polished Tapered Stem -Minimum 2 Years Follow-up Results-

Yerl-Bo Sung; Jung-Yun Choi; Su-Chan Oh

doi:10.5371/jkhs.2012.24.1.18

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Sung, Choi, and Oh: Hip Arthroplasty Using Collarless Polished Tapered Stem -Minimum 2 Years Follow-up Results-

Original Article

The Journal of the Korean Hip Society

The Journal of the Korean Hip Society 2012; 24(1): 18-24.

Published online: 31 March 2012

DOI: https://doi.org/10.5371/jkhs.2012.24.1.18

Hip Arthroplasty Using Collarless Polished Tapered Stem -Minimum 2 Years Follow-up Results-

Yerl-Bo Sung, MD, Jung-Yun Choi, MD, Su-Chan Oh, MD

Department of Orthopedic Surgery, Inje University Sanggye Paik Hospital, Seoul, Korea.

Address reprint request to Yerl-Bo Sung, MD. Department of Orthopedic Surgery, Inje University Sanggye Paik Hospital, 761-1 Sang-Gye 7-dong, Nowon-gu, Seoul 139-707, Korea. TEL: +82-2-950-1032, FAX: +82-2-934-6342, ybs58@paik.ac.kr

Received 20 October 2011 Revised 1 February 2012 Accepted 3 February 2012

Abstract

Purpose

This study evaluated the clinical and radiologic results of total hip arthroplasty and bipolar hemiarthroplasty using collarless polished tapered femoral stem.

Materials and Methods

We retrospectively reviewed the results of 33 patients who underwent THA and BHA using cemented CPT femoral stem from November 2006 to April 2009. The mean follow-up period was 33 months. The clinical results were evaluated with a Harris Hip Score (HSS), and radiographic results were assessed with cement grade, osteolysis, loosening, stress shielding and subsidence methods.

Results

Mean HSS improved with 91 points. Postoperative cement grade was A in 14 cases, B in 14 cases, C1 in 5 cases and D in none. Aseptic loosening was not found, while focal radiolucency in zone 8 was found. 70% of stems showed grade 1 and 2 stress shielding according to Engh's criteria. Subsidence of the femoral stem was less than 1 mm in 32 cases, and was 1.47 mm in another case. Ectopic ossification was observed in 13 cases, class I in 11 cases, and class II in 2 cases, using Brooker's classification.

Conclusion

This study showed the good clinical and radiographic results of THA and BHA with a cemented CPT femoral stem at the mid-term follow-up. However, a long-term follow-up study will be needed to evaluate the more precise clinical and radiographic outcomes.

Keywords: Collarless polished tapered stem, Total hip replacement arthroplasty, Bipolar hemiarthroplasty

Figures and Tables

Fig. 1

(A) Immediate postoperative radiograph after total hip replacement arthroplasy with CPT stem. (B) Radiograph, made 2 years postoperatively showed stable fixation without subsidence or loosening.

Table 1

Dermographic Data

^*BHA: bipolar hemiarthroplasty

^*THA: total hip replacement arthroplasty

Table 2

Clinical and Radiologic Results in BHA Compared with THA

^*BHA: bipolar hemiarthroplasty

^*THA: total hip replacement arthroplasty

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